kopia lustrzana https://github.com/onthegomap/planetiler
63 wiersze
1.4 KiB
Java
63 wiersze
1.4 KiB
Java
package com.onthegomap.planetiler.util;
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/**
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* A container for the result of an operation that may succeed or fail.
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*
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* @param <T> Type of the result value, if success
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*/
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public interface Try<T> {
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/**
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* Calls {@code supplier} and wraps the result in {@link Success} if successful, or {@link Failure} if it throws an
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* exception.
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*/
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static <T> Try<T> apply(SupplierThatThrows<T> supplier) {
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try {
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return success(supplier.get());
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} catch (Exception e) {
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return failure(e);
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}
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}
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static <T> Success<T> success(T item) {
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return new Success<>(item);
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}
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static <T> Failure<T> failure(Exception throwable) {
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return new Failure<>(throwable);
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}
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/**
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* Returns the result if success, or throws an exception if failure.
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*
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* @throws IllegalStateException wrapping the exception on failure
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*/
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T get();
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default boolean isSuccess() {
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return !isFailure();
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}
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default boolean isFailure() {
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return exception() != null;
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}
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default Exception exception() {
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return null;
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}
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record Success<T> (T get) implements Try<T> {}
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record Failure<T> (@Override Exception exception) implements Try<T> {
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@Override
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public T get() {
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throw new IllegalStateException(exception);
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}
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}
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@FunctionalInterface
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interface SupplierThatThrows<T> {
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@SuppressWarnings("java:S112")
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T get() throws Exception;
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}
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}
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